Dallam County. Formed from Young and Bexar territories: Created August 21, 1876; Organized July 28, 1891. Named in honor of James W. Dallam, 1818-1847. Compiler of digest of decisions of Supreme Court of the Republic of Texas, 1845. County Seat, Texline, 1891-1903. Dalhart, since this area was once part of XIT Ranch. (1936) #1158